You must use code numbers (ID numbers) in pass-through authentication to specify parameters such as countries, provinces, custom fields, and organization IDs.
Hovering over the field name
Displaying report IDs in the Reports explorer
Using the NamedID helper object
When exploring reports, you can view the report ID (ac_id) by displaying the ID column in the explorer details.
Many records and items contain an Info button on the Home tab of the ribbon. When you click the Info button, record details display, including the record ID number.